如何使用Laravel 4.2批量删除数据库表中不在数组中的行

Question

I'd like to delete the rows in my table which are not in the array. In the following example, this will mass delete rows that correspond to $cards_to_delete.

$cards_to_delete = array(1, 2, 3);
Collection::where('username', '=', $username)
    ->whereIn('id', $cards_to_delete)
    ->delete();

How can I make it so it deletes everything that is NOT in the array? Something along these lines:

$cards_to_keep = array(1, 2, 3);
Collection::where('username', '=', $username)
    ->whereIn('id', '!=', $cards_to_keep)
    ->delete();

Answer 1

Laravel provides a ->whereNotIn() method as well:

$cards_to_keep = array(1, 2, 3);
Collection::where('username', '=', $username)
    ->whereNotIn('id', $cards_to_keep)
    ->delete();